Sam2 – “…I believe that many nowadays are Makpid to wear T’fillin as little as possible…narrowed it down to just Shacharis…”
That is correct. Due to Yeridat HaDorot, among other issues, it is best to put Tefillin at limited times in the morning (when our minds our clear, etc..)
There are Yechidim who wear Tefillin at Mincha, but that’s not publicized, etc…